The UHF or higher elements of the Scantenna are mounted on the boom beside
the main element. The distance from the main element to the short higher
frequency element is about half of the length of this short element,, or
about 0.25 wavelength for the center frequency of the short element.
Optimal first reflector spacing on a beam is from 0.1 to 0.35 wavelength,
depending on other factors. This means that the main element may well serve
as a reflector for the short element, possibly fairly ineffecient because it
is very much to large, but it should still serve. This would give some
directionality "down" the boom, from the main to the short element.

C!

"Brian" wrote in message
...
On Wed, 19 Jan 2005 05:49:53 GMT, "Keith Coleman"
wrote:
it a omni
what makes you think its directional?

Hi all,

Any of you that has much more knowledge and experince than myself, can you
help?

I know that the scantenna is sold as a omnidirectional antenna, I can't
help
but think that by the design, there is some directionality to this
antenna.

Is this the case? Can someone offer any of their experience to this
thought.

Cheers,
Keith